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Simplifying 3a + 4(9 + 12) = 90 Combine like terms: 9 + 12 = 21 3a + 4(21) = 90 Multiply 4 * 21 3a + 84 = 90 Reorder the terms: 84 + 3a = 90 Solving 84 + 3a = 90 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-84' to each side of the equation. 84 + -84 + 3a = 90 + -84 Combine like terms: 84 + -84 = 0 0 + 3a = 90 + -84 3a = 90 + -84 Combine like terms: 90 + -84 = 6 3a = 6 Divide each side by '3'. a = 2 Simplifying a = 2
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